GATEWAY not apply on Debian13 and Ubuntu 24.04

[rdziwinski]

Hello,
When I add new interfaces with IPv6 and then alias with IPv4 parameter GATEWAY is not applied.
How to reproduce:

Add interfaces to VM, for example:

ETH0_IP6 = "1233:1234:0:123:1::123",
ETH0_IP6_GATEWAY = "1233:1234:0:123::1",
ETH0_IP6_METRIC = "",
ETH0_IP6_PREFIX_LENGTH = "64",
ETH0_MAC = "02:00:99:9a:b3:5c",
ETH0_MASK = "64",
ETH0_NETWORK = "1233:1234:0:123::0",

Then add a network alias with IPv4:

ETH0_ALIAS0_GATEWAY = "8.16.7.254",
ETH0_ALIAS0_IP = "8.16.7.210",

And after that, in the network configuration, there is no default route for IPv4.